Transmission mechanism



Dec. 21 1926. 1,611,790

F. STARR TRANSMISSION MECHANISM Filed Oct. 28. 1922 E 3 INVEINTOR. fi'ea 5m ATTORNEY Patented Dec. 21, 1926.

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Application filed Gctoher aaieea. Serial No. 537,484.

work, andis therefore, a loss of energy and elliciency. In my transn'iission devicel seek to overcome this, and permit both strokes to do equal,- uniform and useful work.

' The major object of theinvention, is to transform the .Ktcrnal forces applied to the cross-head of my device into reciprocal movement thereof, which in turnwill in part continuous transmission to a chain belt. which latter will impart rotary motion to a shaft to do usefulwork. Anotherobject of my invention, and of prime importance the ability, by reversing a lever. to instantly reverse the motion of the chain belt, without reversing the direction of movement of the cross-head. By accomplishing the latter object, dead-center stops are entirely eliminated. i

The invention includes, in general terms, two limbs of a chain belt passing over wheels. a cross-head embracing both limbs and adapted to be reciprocated, said head provided with devices adapted to engage said belt limbs alternately, to keepthe beltmoving continuously in one direction. The

invention also includes means carried by the reciprocating cross-head for reversing said belt movement.

In addition to the above broader features of the invention, there are certain details of design, whereby compactness, simplicity and durability of structure, as well as positiveness and ease of operation are obtained, and which are shown on the accompanying sheet of drawings, and will be set forth hereinafter.

Referring to the drawings:

Figure 1 is a partial sectional elevation, of the operating parts of the apparatus cntrolling the direction of movement of the chain belt.

Figure 2 is an end elevation of the parts shown in Figure 1, also partly in section.

F igure 3 is a side elevation of the working parts assembled.

In the figures, a link belt passing over at respectively.

eating motion.

sprocket wheels has been selected for J an illustration of the invention, but for a specilic application of it, 1 refer one to my sued Patent No. 1,500,854- of July 8, 192a, and titled (hilds occupant-propelled vehicle. V

in this patent the sprocket wheels are desi gi'iated by the numerals 1 and 2, and the two limbs of the continuous link belt, by 3 and 5 is a reciprocating crosshead, supported and guided by bar 6 between fixed members 7, the latter so placed as to maintain the cross-headbetween and out of contact with the sprocket wheels 1 and 2. A pitman, connecting rod, or other mechanism 8, pivotally connected to the cross-head 5, as at 9 ,fservestoimpart the applied forces to give the latter its reciprolletwcen the sides or walls of the crosshead and-between theliinbs of the liiilobelt, is an oscillating headlO mounted on the same shafto which supports and pivots the rod .8. T his head is keyed totbe said shaft and the latter projects laterally from the crr ss-head, as seen in Figure 2.

A lever 11 is secured to the shaft 9, by which the head may be oscillated between two extremes, it being held in the position to which it is moved by catch bolts 13, slidably secured in the head and engaging countersunk stops 1 which are formed in the crosshead 5 and into whichthe bolts are projected by springs 15.

Pawls of hook form 16, 17, .18 and 19 are pivoted in fixed relation to the cross-head 5,

as at 20. Each of the pawls is provided with an integral tail piece, normally contacting the head 10 which limits its movement to: ward the belt. Springs 21, which may be plain flat springs as shown, or otherwise, are secured to the head 10 and press the pawls toward the belt.

The working unit; consists of a pair of pawls or hooks diagonally positioned, a hook of the pair may engage any link of the belt for pulling the belt in one direction anydistanoe, while its diagonal mate will ride or bump over the same distance of links moving in the opposite direction, the remaining pair of hooks not functioning. Thus, as shown in Figure 1, the hook 16 is pulling the belt to the right, while its mate 17 is bumping over the links moving to the left, and the other pair of hooks are out of con tact entirely with the belt. When it is desired to reverse the direction of the belt, the lever 11 is moved to the other extreme, this reach of the belt, and the pawls l8 and 19 thrown into action, and the cross-head is now ready to move the belt in the reverse direction to that just above described, the cross-head not reversing its direction until it reaches the end of its stroke or travel.

Moving the lever 11 to the middle of its travel, the head 10 will occupy a position parallel to the limbs of the belt, the catch bolts 13 engaging the center stops, and all the pawls will be held inneutralposition and out of reach with either limb,

Each pawl, remotefrom its pivot 20, has a pin 12 secured thereto to serve as an outer bearing between thewalls of the cross-head for guiding the hooks info the links.

In the drawings, I have shown only one specific form of my invention, and it is to be understood that the invention may be embodied in other forms, each being; a species of my invention.

lVha't I claim as new and desire to secure by Letters Patent of the United States, is the following:

1. A transmission mechanism, comprising in combination, a belt having two limbs, a cross-head adapted to reciprocate along said belt, an oscillating head pivotally mounted on said cross-head, pawls connected to said reciprocatinghead, said pawls controlled by said oscillating head, means urging said pawls toward said belt, and means restraining said pawls against said urge, said pawls adapted to engage the limbs of the belt alternately.

2. A transmission mechanism comprising in combination, an endless belt, a cross-head adapted to reciprocate along said belt, a plurality of belt-engaging members carried by said cross head for driving said belt, an oscillating head pivotally mounted on said cross-head for controlling said belt-engaging members, a hand lever rigidly attached to said oscillating head and movable with said reciprocatingcross-head for actuating said oscillating head, and spring-actuated bolts slidably secured in the oscillating head and adapted to engage stops in the cross-head in order to retain the oscillating head in position for driving the belt in either direction or to retain the oscillating head in a neutral position. i

3. A transmission mechanism comprising in combination, an endless belt, a cross-head adapted to reciprocate along said belt, a plurality of belt-engaging members carried by said cross-head for driving said belt, spring means for holding said belt-engaging members in engagement with said belt, an oscillating head pivotally mounted on said cross-head for controlling said belt-engaging members, a lever formed as a part of said oscillating head, and spring-actuated bolts slidably secured in the oscillating head and adapted to engage stops in the cross-head in order to retain the oscillating head in positionifor driving the belt in either direction or to retain the oscillating head in a neutral position.

In tesiimony whereof I afiix my signature FRED STARR. 

